I'm only just off the main road at the front and there is a bus stop a few 100 yards from me where you can catch the services that run between Norwich and Sheringham. Weekdays between about 7:30am and 5pm, I think it works out as a bus (each way) available roughly every 30 minutes. Looking at getting home from Cromer after that time, I think my choices would be one but around 6pm and one around 9pm.

Someone mentioned Wales above. The (N Wales) village I lived most of time there just had a weekday lunchtime service and the ones that would tie in with getting to/from Llandudno secondary school. It's location was very convenient for those with cars, being in easy reach of the main towns of Conwy, Llandudno and Colwyn bay as well as to get onto the A55 express way but you would be looking at at least a mile walk (up a steep hill coming back, and shortest routes would use footpaths) to get onto a main bus route.